Math, asked by monirul9036, 1 year ago

What is the common deference of an Ap . In which a21_a7=84

Answers

Answered by anirudhsingh87

0

a21-a7=84(given)

then

a+20d-a-6d=84

14d=84

d=84/14

d=6 .....ans

hope it helpful

Nimai7: Why you have taken -6d

anirudhsingh87: because of minus sign

anirudhsingh87: -(a+6d)

anirudhsingh87: now you open this bracket

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